Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['b', '923', '5997', '239', '7643', '9897', '6359']

2, 923, 5997, 239, 7643, 9897, 6359